Drop old Python and Django versions

[merwok]

fixes #176

[codecov]

Codecov Report

Base: 94.60% // Head: 94.78% // Increases project coverage by +0.18% 🎉

Coverage data is based on head (10d54fc) compared to base (333025f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   94.60%   94.78%   +0.18%     
==========================================
  Files          37       36       -1     
  Lines         426      403      -23     
==========================================
- Hits          403      382      -21     
+ Misses         23       21       -2     

Flag	Coverage Δ
unittests	94.78% <100.00%> (+0.18%)	⬆️

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Impacted Files	Coverage Δ
admin_interface/cache.py	100.00% <ø> (ø)
admin_interface/settings.py	68.75% <ø> (-25.70%)	⬇️
admin_interface/version.py	100.00% <ø> (ø)
admin_interface/admin.py	100.00% <100.00%> (ø)
admin_interface/apps.py	100.00% <100.00%> (ø)
...erface/migrations/0021_file_extension_validator.py	100.00% <100.00%> (ø)
admin_interface/models.py	100.00% <100.00%> (ø)
...min_interface/templatetags/admin_interface_tags.py	80.72% <100.00%> (+0.26%)	⬆️

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